Video Explanations

General

Khan Academy
A great set of explanations for a wide variety of math and science problems - a must see and use reference

Google Videos
Type in almost any math topic and you will find numerous video explanations

Teacher Tube
A place to find a lot of fun videos related to teaching without all of the viral videos of youtube.

Grade 8 Concepts (Ontario)

Pythagorean Theorem
12. Squares and square roots - Kahn Academy (Squares and Square Roots), Longer, funnier video.
14. Estimating Square Roots - Brightstorm Website
15. The Pythagorean Theorem - The Pythagorean Theorem on Youtube
16. Explore Pythagorean Theorem
17. Applying Pythagorean Theorem - Pythagorean Word Porblem

Area & Volume
42. Creating objects from nets- Geometry Nets - YourTeacher.com - Math Help - http://www.youtube.com/watch?v=B_1JBtVNjzc
43. Surface area of a rectangular prism - http://www.youtube.com/watch?v=oR1ukNC1pvA
44. Surface area of a triangular prism
45. Volume of a rectangular prism - http://www.youtube.com/watch?v=wKQY7FAbm_M

47. Surface area of a cylinder
48. Volume of a right cylinder http://www.youtube.com/watch?v=SBQVElPFSE8&feature=related

Integers
21. Using Models to Multiply Integers : http://www.youtube.com/watch?v=bNHRK9Fu58s
22. Developing rules to multiply integers: http://www.youtube.com/watch?v=R3M5Ktv3sLc (no videos about developing rules, but this one provides a good model)
23. Developing rules to divide integers http://www.youtube.com/watch?v=GkbXbptFnnw
24. Developing rules to divide integers Multiplying and Dividing Integers using Triangle

25. Order of operations with integers

Decimals & Ratios
51. Relating fractions, decimals, and percents: Fun Song - Introduction
52. Calculating percents
53. Percent problems Khan Academy - Percent Problems
54. Calculating sales tax & discounts http://www.youtube.com/watch?v=WR8crYu0HiU&feature=fvw
55. Exploring ratios http://www.youtube.com/watch?v=054uItK-KPU
56. Equivalent Ratios http://www.khanacademy.org/video/equivalent-fractions?playlist=Developmental%20Math

Fractions
33. Multiplying fractions http://www.youtube.com/watch?v=yHR5hj4Zdjo
34. Multiplying mixed numbers
35. Dividing whole numbers and fractions
36. Dividing fractions
http://www.youtube.com/watch?v=ZC8AiXTcjKw&feature=related
37. Dividing mixed numbers: Khan Academy - Dividing Mixed Numbers
38. Solving Problems with Fractions

Equations & Graphing
61. Solving equations using models
62. Solving equations using algebra http://www.youtube.com/watch?v=W7fPsSw74TM
63. Solving equations involving fractions YourTeacher.com (1m35s)
64. Distributive property http://www.khanacademy.org/video/the-distributive-property?playlist=Developmental%20Math
66. Creating a table of values http://www.teachertube.com/viewVideo.php?video_id=27822
67. Graphing linear relations